论文标题
DES16C3CJE：低亮度，长寿的超新星
DES16C3cje: A low-luminosity, long-lived supernova
论文作者
论文摘要
我们提出了DES16C3CJE，这是一种低亮度，长寿命的II型超新星（SN II），在Redshift 0.0618处，由暗能量调查（DES）检测到。 DES16C3CJE是一个独特的SN。光谱的特征是非常狭窄的光晶线，对应于非常低的膨胀速度为$ \ lyssim1500 $ km s $ s $^{ - 1} $，光曲线显示出最初的峰值，在50天后逐渐淡出，此前50天后逐渐消失，然后在另外100天内缓慢重新升起，以达到m $ _ $ _r \ sim -15.5 $ -15.5 $ -15.5 $ MAG的绝对亮度。然后，延迟光曲线的下降速率比放射性衰减$^{56} $ CO的动力所预期的速度慢，但与增生功率的预期相当。将降压光曲线与流体动力学模型进行比较，我们发现DES16C3CJE可以通过i）i）低爆炸能量（0.11敌人）和相对较大的$^{56} $ ni产生0.075 m $ _ $ _ {\ odot} $的0.075 m $ _ {\ odot} $来自$ \ sim15 $ \ sim $ \ sim $ m $ $ _ $ _} $ _} $ _}的; ii或ii）一个相对紧凑的$ \ sim40 $ m $ _ {\ odot} $ star，1个敌人的爆炸能量和0.08 m $ _ {\ odot} $ $^{56} $ ni。两种情况都需要额外的能量输入来解释延迟光曲线，这与后备积聚的速度是$ \ sim0.5 \ times {10^{ - 8}} $ m $ _ {\ odot} $ s $ s $^{ - 1} $。
We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of $\lesssim1500$ km s$^{-1}$, and the light curve shows an initial peak that fades after 50 days before slowly rebrightening over a further 100 days to reach an absolute brightness of M$_r\sim -15.5$ mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of $^{56}$Co but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either i) a low explosion energy (0.11 foe) and relatively large $^{56}$Ni production of 0.075 M$_{\odot}$ from a $\sim15$ M$_{\odot}$ red supergiant progenitor typical of other SNe II, or ii) a relatively compact $\sim40$ M$_{\odot}$ star, explosion energy of 1 foe, and 0.08 M$_{\odot}$ of $^{56}$Ni. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of $\sim0.5\times{10^{-8}}$ M$_{\odot}$ s$^{-1}$.
